RPRNY
02-09-2013, 08:21 PM
First post but I have been lurking and reading for some time. Thanks already for a great deal of information. I am new to cast bullets in bottleneck cartridges but have loaded cast in 45 Colt for some time.
I recently purchased a very nice Krag Sporter (30-40) that had been fitted with a seemingly very nice newer (@ 1960?) barrel. It slugs a true .308". The chamber is only slightly capacious and it has the usual long throat. I am getting just over 1/8" of freebore with the Lyman 311284 (210 gr GC) - distance between seated bullet tip and where it seats in the lands.
My first question is as follows. I purchased these bullets (311284 HT GC 210 grs) sized .310. The driving bands are so sized. The long area above the cannelure before the ogive is however sized .301 and will fit with a push into the bore up to the cannelure. No wiggle but no engraving. Do I understand correctly that this is in keeping with the design and a tighter fit here is not required?
My second question is with regard to H4350 and cast bullets. Lyman 49 only provides data for faster burning powders with this Lyman bullet. It gives data for the similar IMR 4350 but onlly foor the 220 gr Hornady RN jacketed bulllet. Hodgdon gives a start of 41 grs but that is with jacketed bullets. Is it safe and appropriate to use start data for a jacketed bullet with cast? I assume cast will simply deliver a slightly higher velocity and slightly lower pressure than published for the jacketed, but we all know about ***-ume.
Thanks for your guidance.
The rifle:
http://i203.photobucket.com/albums/aa272/LRDG/Krag/pix026959664.jpg
I recently purchased a very nice Krag Sporter (30-40) that had been fitted with a seemingly very nice newer (@ 1960?) barrel. It slugs a true .308". The chamber is only slightly capacious and it has the usual long throat. I am getting just over 1/8" of freebore with the Lyman 311284 (210 gr GC) - distance between seated bullet tip and where it seats in the lands.
My first question is as follows. I purchased these bullets (311284 HT GC 210 grs) sized .310. The driving bands are so sized. The long area above the cannelure before the ogive is however sized .301 and will fit with a push into the bore up to the cannelure. No wiggle but no engraving. Do I understand correctly that this is in keeping with the design and a tighter fit here is not required?
My second question is with regard to H4350 and cast bullets. Lyman 49 only provides data for faster burning powders with this Lyman bullet. It gives data for the similar IMR 4350 but onlly foor the 220 gr Hornady RN jacketed bulllet. Hodgdon gives a start of 41 grs but that is with jacketed bullets. Is it safe and appropriate to use start data for a jacketed bullet with cast? I assume cast will simply deliver a slightly higher velocity and slightly lower pressure than published for the jacketed, but we all know about ***-ume.
Thanks for your guidance.
The rifle:
http://i203.photobucket.com/albums/aa272/LRDG/Krag/pix026959664.jpg