Ballistic physics of mine

www.hodgdonreloading.com
Fast powder can be decreased for light recoil. Slow powder can be increased for high speed. Shooting upward will not decrease the drop while shooting downward will decrease the drop substantially in my long experience of slug guns.

[@PhilG-v7m]

The attention to detail you put in your work is outstanding. Thank you sharing with us.

[@cruzchavez1974]

Hello Ballistic people ! ... WAKO is hard core ... Reloads and his knife edge can shave the hair off your mug like nothing .... Thank you Wako for all the years of AWSOME videos !

[@anttisaarilahti5975]

Flattened primer is the first sympton that your load is close or over the safe chamber pressure. Next step is stiff bolt handle and blown off or pearced primers. Shiny marks in the case head will also occur with too high chamber pressure. When testing for close max loads always do the testing in warmer weather than the intended shooting conditions. The powders tend to produce higher pressures as the temperature rises and vice versa.

[@JinkxSoldga]

elevation and humidity make drastic differences as well. If you practice shooting at sea level, then head into mountains and shoot, your point of impact will be different. Very interesting points on powder burn rates and pressures and angle and gravity!!!

[@anttisaarilahti5975]

When the bullet ballistc coefficient (b.c.) and muzzle velocity are known it is easy to sight in your rifle to hit say 2-4 cm high at 100m. That will usually result as 150m zero and you can shoot without worries game up to 180-200m. The bullet stays in vertical "tube" so small that you are able to make clean kills with out worrying how much vertical compensation to make. Naturally at longer than 200m distances the compensation must be done.

[@virtuovice]

My ammo menu is 308Win; 110gr bullet and 24gr IMR4227 for kneeling and standing shot training. 150gr bullet and 42gr DC300 (almost the same as IMR3031) for hunting. 270Win; 140gr bullet and 46gr IMR 4064 for middle range hunting under 300m. 130gr bullet and 56gr IMR 4350 for long range hunting over 300m.

[@StamNorth71]

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[@virtuovice]

***** I understand your theory. Heavier bullet keeps its speed longer and curves less. I will need to change my menu on .270. Thanks.

[@rcsnow22]

love my .270

[@rcsnow22]

I do also have a 30-06 among many others like the model 99 in 300 Savage . Another favorite caliber or rounds for Deer here in Georgia is the Swedish 6.5 X 55 . Surely not up to the .270 or 30-06 for 250 out to 4 or 500 yard shots , but to me , simply a beautiful round and a delight to shoot . ---- Very nice to hear from you . Best and Pleasant Wishes Always !

[@rcsnow22]

Really good information always !

[@iliveoutside]

You might be best suited to practice with the same loads you will hunt with, also to test your ballistics at the longest ranges you intend to hunt. Did you read about maximum point blank range concept? that is something you would probably be interested in. Also another tip, you can use a micrometer to measure your fired cases before and after near the primer end, compare readings to a known safe maximum factory load, this will indicate if you are getting close to safe maximum pressures.

[@stefanwolf88]

If I remember correctly the maximum pressure for .270 win is around 65,000 psi /450 MPa/... so you are in the safe zone but you can try for the 130gr bullet and IMR 4350 combo to back up (one) 1gr.

[@briargoatkilla]

Keep it simple the first couple years. Practice with your hunting ammo. Zero at 100 yards. Whatever range that your bullet drops two inches below zero is your maximum effective range. Same aim point on every animal. Uphill, downhill, strong crosswind makes no difference and you will hardly ever miss or lose an animal.

[@TheCarbaxin]

I like your ammo videos

[@orozjetv]

I use the same principle in my practice and hunting ammo. For target practice I load light bullets with fast powders, for hunting ammo I use normal weight bullets with near maximum velocity. In .30-06 I used JSP @ 2700 fps for hunting, and 110 Sierra HP @2200 fps for target practice. At 100 yards light load impact POA and hunting load 2" high.

[@pappywith4]

I suggest looking at a nosler reloading manual it has already worked up the most accurate load which is the most important thing in reloading!

[@58rsm]

52g IMR 4350 is what I use for 140g Sierra Game King bullet for accuracy in my remington 700 270 Win @ 3.160". 53.5 is max IIRC.

[@bennettmontgomery7519]

Be careful the change in weight of bullets changes the flight of it

[@jurijklanjscek7733]

If we're talking about hunting distances (300 m or less), the bullet flies for a fraction of a second, so gravity only has a minimum amount of time to act and decrease its speed. Gravity is roughly 9,8m/s2, so, even if you shoot straight upwards and your target is 300 mt above you, it will only decrease the speed of the bullet for less than 10m/s. The major factor affecting the bullet's speed is air resistance, but that's the same when shooting upward or downward.

[@virtuovice]

I forgot to say that the drop theory of mine about diagonal shots was for twice as long range as the scope zero-in range where the bullet speed was very slow mainly because of the air resistance. For shotguns my theory should be applied for 200m and for rifles for 400m. Thanks.

[@bloffi]

Hello Wako! Please keep in mind that the data from the books don't match with your personal rifle, case and primer combination. (F. e. speed is different out of a 22" or 20" Barrel) The only way to verify your personal load is to measure the bullet speed with a chrony. Having the speed with your load out of your rifle you can calculate all the other Data, like pressure, bullet drop etc. In my opinion it makes not much sense to have so many different loads for different distances when you go hunting. I would develop one load which is accurate, send it through a chrony, get a ballistic chart out of it and zero the rifle. Depending on the reticle in your scope you can compensate for bullet drop or adjust the turrets. Good luck and stay safe!

[@Logjam5]

Good.

[@ant28gauge]

My humble experience. Some years ago, the classic .308 load was 40 to 41 grains of 4895 for a 168 gr HPBT bullet (24 inch barrel). Very accurate for competitive shooters. .308 shoots best groups with the bullet seated with an AOL allowing the bullet to touch the lands of the rifleing. If you chamber a loaded round and then remove it, with a mag glass you should see the land marks on the ogive of the bullet.

[@virtuovice]

Some say that lands touch seating is dangerous about our solid copper bullets because the primer can make very high pressure when the bullet doesn't move at all. So I seat my bullet 1.5mm before the lands. Thanks.

[@anttisaarilahti5975]

virtuovice It´s common to have the bullet seated near the lands, say 0,2 mm away. A change in the bullet seating depth from 0,2 mm off to contact with the lands can produce peak in the pressure so be careful especially if working with near max powder charges. Be advised that you can get quite a good accuracy and bullet velocity using just the C.O.L stated in the loading manual. Long range afficianados use all the tricks to max their equipment and performance. With longer C.O.L. you can add more powder as the case volume increases. When choosing the powder for accuracy load it is usually preferred to use powder that fills the case volume. Compressed loads are sometimes done also. If there is too much compression it becomes difficult to maintain the uniform C.O.L from catridge to cartridge. Solid copper bullets are harder than jacketed lead bullets. It is usual that you can´t use the load data of same weight jacketed bullet but one size heavier. Best option is to look for the data provided by the bullet manufacturer.

[@anttisaarilahti5975]

Antti Saarilahti Some solid copper bullets are advised to load of the lands with greater margin than jacketed bullets. Adequate free movement of bullet before hitting the lands will soften the pressure peak. The solid copped bullet produces more pressure as the friction in the barrel is higher.

[@dugspencer80]

watch the bullets at 6.25 , it's a ghost

[@TheCarbaxin]

Flat primer = overpreasure. Use less powder

[@1HeavyHitr]

good video doc. what kind of scope did you go with? You should pick up some .308 130 gr TSX and turn that .308 into a little 270! ;) bullet BC is obviously lower. when are you going to show us your rifles?

[@juudjedegoede]

Doc, I normally like your vids. But. For a .308 and for the .270 your speed is to high. You should use a heavier bullet for the .308 minimum 145grs , better ~167,~180, ~185grs. The twist isn't ideal for high speed and low weight bullets. The speed should be

[@virtuovice]

I am a rifle beginner and like to make the max speed so far to kill a distant deer. I think my speed is still in the safe range although sacrificing accuracy a bit. I will start this hunting season in these ammo settings. I won't increase powder any more but decrease according to your suggestion. Many people here suggest as you do. Almost all hunters as far as I know here use 150gr for deer and 168gr for bears for .308Win. I will need to make 168gr setting for .308 soon. Thanks.

[@shanefortworth]

How did you determine the values 1 & 0.7? I am assuming you are using vector calculus and the down arrows are vectors orthogonal to your shooting angle?

[@virtuovice]

Yes. We can divide the earth gravity into the two orthogonal vectors. And the length of each vector is calculated by trigonometry. The perpendicular vector to the shooting line makes the bullet drop. 0.7 is substantially smaller than 1 in my opinion. But I think this issue happens only when the bullet speed is slow enough when the target is over 300 yards with a rifle or over 150 yards with a slug. Then the drop is smaller by 2 inches or so in 150 yards in case of a steep down angled shot in my hunting experience with a slug gun. I haven't taken this issue into account in my past slug hunting history. And I remember the upward shots have made a lower hit rate than the horizontal shots but the downward shots have made a higher hit rate and often made the spine shots. We are not allowed to do target shooting in the field outside the shooting range. So I am sorry for the fact that I cannot make this issue clear by the real experiments. Thanks.

[@chasehall8691]

What book is that exactly?