Model 41 Carcano Reloading Help!!

[concretus]

I loaded a few rounds @ 34.0 gr of H-414 w WLRM primers and the .268 dia. 160gr Hornady bullets. Followed the Hornady sheet. It still blew out the primer. Then I tried the 160gr Hornady RN at .264 dia.. Started at 34.0gr (as recommended), 35,0 and 36.0. The 34gr load blew gas back do failure of the case to expand and seal in the chamber. The 35.0 gr load fired off but the primers were raised after inspecting the case. The 36.0 gr load actually fired good with a 3"-4" group and the cases looked fine. No flattened or blown primers. Text book of what happens w/ low charges slow burning/ magnum type primers. It's a start and seems promising.
I have a question; Since the rifle is somewhat shooting decent w/ .264 dia bullets, would the 160gr RN bullets be preferred due to the added surface area, or could I try the 140gr bullets? Also, with the smaller dia bullet; can I use a regular large rifle primer w/ the other type powders; (IMR4064, Varget, H4895, IMR 4350, etc)?

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[Parashooter]

I have a question; Since the rifle is somewhat shooting decent w/ .264 dia bullets, would the 160gr RN bullets be preferred due to the added surface area, or could I try the 140gr bullets? Also, with the smaller dia bullet; can I use a regular large rifle primer w/ the other type powders; (IMR4064, Varget, H4895, IMR 4350, etc)?

The answer to all three questions is yes.

Be sure to read and understand Dave Emary's comments at SHOOTING THE 6 before experimenting further with the .268" Hornady bullets. Although his experience with H414 differs from yours, the underlying phenomena described may give some insight into your problems.