I have two .45 caliber cast boolits. One, is a traditional 250 grain round nose flat point design. The other, is a Laser-Cast 255 SWC.
Which one has the most surface bearing area?
Thank you
I have two .45 caliber cast boolits. One, is a traditional 250 grain round nose flat point design. The other, is a Laser-Cast 255 SWC.
Which one has the most surface bearing area?
Thank you
Have a set of calipers? Just measure the twoI have two .45 caliber cast boolits ... Which one has the most surface bearing area?
Regards
John
you'll have to see how much of the rn above the crimp groove is groove diameter.
[some have an invisible drive band right there]
then you can measure from there down and subtract the lube groove and crimp groove length to get your total.
I wouldn't use just the drive band length to determine accuracy or velocity potential before using them.
If you place a boolit into the fired casing nose first, and then measure what is sticking out, you should be able to get a rough idea.
If you push both through a sizer and see what portion of the boolit is sized on each, that might give you some idea too...
Good-luck...BCB
Ditto on the sizer method.
"Life is tough, but it's tougher when you're stupid." John Wayne
What are you looking for? If looking to use a formula, forget it. None work. Only load work works.
I found most Laser Cast were under size to groove. Nice boolits if they fit.
I have been shooting an HSM 250 grain cast RNFP slug on top of 9.5 grains of BE-86 from my 1989 S&W 625 in .45 Colt. Shoots great with no signs of pressure issues.
I recently landed some Laser-Cast 255 grain SWC. I am just wondering if there would be any concern with substituting this boolit in place of the RNFP that I am currently using. I assume the best thing to do is drop back down on the powder and work my way up, again.
OK, I see your point, maybe deeper seating. That should be the only concern not the area.
OK. I will check out the seating depth. Thank you.
BP | Bronze Point | IMR | Improved Military Rifle | PTD | Pointed |
BR | Bench Rest | M | Magnum | RN | Round Nose |
BT | Boat Tail | PL | Power-Lokt | SP | Soft Point |
C | Compressed Charge | PR | Primer | SPCL | Soft Point "Core-Lokt" |
HP | Hollow Point | PSPCL | Pointed Soft Point "Core Lokt" | C.O.L. | Cartridge Overall Length |
PSP | Pointed Soft Point | Spz | Spitzer Point | SBT | Spitzer Boat Tail |
LRN | Lead Round Nose | LWC | Lead Wad Cutter | LSWC | Lead Semi Wad Cutter |
GC | Gas Check |