Originally Posted by
martinibelgian
Bore or groove diameter PP? I'm lucky in that in my rifle I have the ability to shoot both under the best circumstances - meaning that I have to neckturn my cases for groove diameter bullets, which requires dedicated cases per type of ammunition (well, for me at least). Each type has its pluses and minuses, so here some observations in no particular order:
- Groove diameter shoots cleaner than bore diameter, judging from the amount of fouling in the cases after shooting
- Bore diameter is less delicate as to ammo prepping: Patch a groove-dia. bullet a smidgen too long, and you'll have a sore thumb...
- Bore diameter - obviously - allows you to use more powder for a given case: can be plus or minus, depending or the case used
- Accuracy? little or no difference actually, assuming correct loading techniques for both - but in my rifles equal or better than with GG bullets
- Case prepping for groove dia. bullets is much more involved and time-cpnsuming, obviously - but that's in my specific case.
Bottom line, both work. For reference purposes, here the bullet/paper dimensions I'm using for both types:
Bore dia. PP : .443 naked, patched to .450-1
Groove dia. PP: .450 naked, patched up to .458-9
Just my experience, and I'm quite sure others will have different opinions; I can only say this works for me...