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Post by sw on Feb 28, 2009 21:40:01 GMT -5
When the trigger is pulled and the bullet swells into the bore of the rifle, wouldn't that take care of any out of round bullet. Yes, but... The problem is the difference in the tightness of each bullet which would affect the pressure rise rate and resultant initial pressure/velocity. Things need to be kept the same. That is the goal of precision reloading. The little bitty things count. This isn't little bitty - it is major. |
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Post by rexxer on Feb 28, 2009 22:05:51 GMT -5
sw-Pretty good report. I will probably buy a die now and knurl up. It might explain why Harley"s gun shoots so well. So if my bore is .4497 would you go with a .448 die or a .449? Thanks Rex
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Post by Harley on Mar 1, 2009 0:28:48 GMT -5
Rex, I'd like for SW to respond, but I am strongly in favor of your going for the .448. As they say, though, you pays your money and you takes your chances.
Harley
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Post by sw on Mar 1, 2009 9:11:33 GMT -5
sw-Pretty good report. I will probably buy a die now and knurl up. It might explain why Harley"s gun shoots so well. So if my bore is .4497 would you go with a .448 die or a .449? Thanks Rex My total re-sizing experience is the receipt of 25 re-sized bullets to try. IE, I have NO re-sizing experience. My guess is 448 because of some spring-back but others can better answer this question. Spring-back will likely be bullet dependent and, if all copper, degree of pre-sizing preparation. |
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Post by TGinPA on Mar 1, 2009 11:21:05 GMT -5
I have always been troubled by the inconsistency in bullet diameter produced by my knurling efforts. Something I have noticed using the Lee resizing dies is that repeated passes through the die will often further decrease bullet size, even for solid copper bullets. So after one pass, if a bullet is a bit too tight, a second and even a third pass may bring it down to a point where it can be loaded without excessive force. This at least this gives me the sense that I am being more consistent, controlling bullet size by the number of passes through the die.
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Post by Dave W on Mar 1, 2009 12:03:03 GMT -5
I have always been troubled by the inconsistency in bullet diameter produced by my knurling efforts. Something I have noticed using the Lee resizing dies is that repeated passes through the die will often further decrease bullet size, even for solid copper bullets. So after one pass, if a bullet is a bit too tight, a second and even a third pass may bring it down to a point where it can be loaded without excessive force. This at least this gives me the sense that I am being more consistent, controlling bullet size by the number of passes through the die. Are you getting less springback with solid coppers and what size die are you using? Found the same thing to be true with my die, some bullets take more passes to make them work. |
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Post by Harley on Mar 1, 2009 13:33:45 GMT -5
My experience with knurling is limited to the Parker, and to a much lesser degree, the XTP. With the Parker, in particular, you can forget about spring back, just go through the following steps for a consistently good outcome:
1. For the .45 Pac-Nor, buy the Lee (or equivalent) .448 die
2. Re-size each bullet twice; this tends to iron out inconsistences in concentricity, while reducing the overall diameter
3. Knurl enough that the knurled bullet is not "cupped" when placed on the upturned muzzle of the rifle.
4. Use a SpinJag Short Starter or other centering device to ensure a good beginning push.
5. Seat firmly, but no need to lean into the ramrod.
Harley
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Post by rexxer on Mar 1, 2009 14:00:23 GMT -5
Harley
Without a doubt your shooting recipe has had great success! Probably sold a few pacnor barrels too!
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Post by TGinPA on Mar 3, 2009 12:04:17 GMT -5
Like Harley, I use a .448 Lee resizing die. The number of passes through the die required to get a perfect fit may vary depending upon which bullet I am resizing. For example, with a 300gr. XTP, it takes me 4 passes/bullet to get a perfect fit, requiring no knurling.
Resizing all-copper bullets is on the edge of what I think my press (RCBS Rockchucker) is capable of handling. With a few tricks, a lot of effort, and a handle extension, I can resize .458 300gr. Triple Shocks (Barnes TSX FB) with this press. Bullet springback during resizing all-copper bullets seems a lot less than with copper jacketed bullets. But, for me, it is not totally eliminated. Repeated passes through the die will further decrease bullet diameter, but by less and less with each pass. IMO, annealing copper bullets before resizing helps reduce springback and significantly lessens effort needed to get the bullet through the die, at least on the first pass.
Shooting sabotless has produced visible copper fouling at the muzzle. I am not convinced that it has affected group size, But I scrub it out whenever I see it, just in case. I would guess that annealed copper bullets, being softer, might contribute to increased copper fouling?
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