WHY ARE JACKETED BULLETS MORE ACCURATE THAN CAST BULLETS?

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  • Last Post 22 January 2017
joeb33050 posted this 21 January 2017

I find that .22 jacketed bullets shoot far more accurately than .22 cast bullets in my guns at cast bullet velocities.  

With jacketed bullets at cast bullet velocities, group averages are ~ 1” for five 5 shot 100 yard groups, with a Savage Striker 22-250 or a Savage M12 with a HV 223 barrel. 

With cast .22 bullets, the best group averages are ~ 1.5” , with many barrels, bullets and several powders. 

I think that this shows that the accuracy difference isn’t caused by the shooter, the bench rest equipment, the powders or charges, the guns or the reloading equipment.

 

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.22-10-45 posted this 21 January 2017

When at last my Shillen barrled Sharps Borchardt in .22 Hornet was finally finished..I tried every jacketed bullet including some expensive match grade and just about every powder recommended.  I was getting some groups down in the .300"s at 100yds.  This then was my accuracy benchmark..then  the real work started.  I tried just about every .22 mould I could get my hands on..finally ended up having Fred Leeth cut two nose-pour moulds..one gas-check, the other, plain-base..both weighed 50grs.  This helped..but the next improvement breakthru was when I made a tapered sizer die for my Lyman 45.  1st band from ogive is taper sized to match leade angle & dia.  This has improved accuracy the most.  At 100yds., I have shot many 3 shot groups in 3/8"..alot of 5 shot 1/2” ones, but for day in day out 5 shot 3/4” is normal...10 shots are closer to 1".  It can be done..but it takes commitment..and patience!  It was fully 5 years before I could equal the best jacketed loads.  During that time, I seldom went to the range with any other rifle.

Attached Files

joeb33050 posted this 21 January 2017

When at last my Shillen barrled Sharps Borchardt in .22 Hornet was finally finished..I tried every jacketed bullet including some expensive match grade and just about every powder recommended.  I was getting some groups down in the .300"s at 100yds.  This then was my accuracy benchmark..then  the real work started.  I tried just about every .22 mould I could get my hands on..finally ended up having Fred Leeth cut two nose-pour moulds..one gas-check, the other, plain-base..both weighed 50grs.  This helped..but the next improvement breakthru was when I made a tapered sizer die for my Lyman 45.  1st band from ogive is taper sized to match leade angle & dia.  This has improved accuracy the most.  At 100yds., I have shot many 3 shot groups in 3/8"..alot of 5 shot 1/2” ones, but for day in day out 5 shot 3/4” is normal...10 shots are closer to 1".  It can be done..but it takes commitment..and patience!  It was fully 5 years before I could equal the best jacketed loads.  During that time, I seldom went to the range with any other rifle.

 

How about going to the range and shooting five 5 shot groups, measuring them and showing us the target ?

I've shown you mine, now show me yours.

joe b.

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John Carlson posted this 22 January 2017

I've found my cast bullets much more sensitive to barrel conditioning than jacketed.  My .223 would consistently put the first bullet around 3/4” at 7 o'clock from a clean barrel then settle in.  My 30-06 takes several groups to really settle in after a thorough cleaning.  I have yet to compare cast and jacketed from the same gun.

John Carlson. CBA Director of Military Competition.

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