Looking to Clone the MKVII 303 British Round

earlthegoat2 · February 22, 2010, 01:09 PM

Looking for a decent combination of a flat based 174 gr bullet and powder to duplicate the MK VII British round.

I have IMR 4895 but I am open to anything right now. The bullet I am using is the Hornady Interlock 174 gr 312 diameter.

**Unclenick** · February 22, 2010, 04:01 PM

Unfortunately I don't know of anyone making a 174 grain flat base spitzer. The Hornady round nose is as close as anything in that weight. IMR 4895 is probably fine. Figure to work up to about 40 grains with the round nose seated to the crimp cannelure, but less if the nose shape makes you seat it deeper for your rifle's throat?

I recall Hatcher wrote of working with powder between the wars that he said was similar to modern IMR 4320. Figure to work up to about 41 grains of IMR 4320, if you decide to go to that?

February 22, 2010, 01:09 PM	#1
earlthegoat2 Senior Member Join Date: March 20, 2009 Location: Lowcountry Posts: 373	Looking to Clone the MKVII 303 British Round Looking for a decent combination of a flat based 174 gr bullet and powder to duplicate the MK VII British round. I have IMR 4895 but I am open to anything right now. The bullet I am using is the Hornady Interlock 174 gr 312 diameter. __________________ I say take off the warning labels and let them sort themselves out.

February 22, 2010, 04:01 PM	#2
Unclenick Staff Join Date: March 4, 2005 Location: Ohio Posts: 21,063	Unfortunately I don't know of anyone making a 174 grain flat base spitzer. The Hornady round nose is as close as anything in that weight. IMR 4895 is probably fine. Figure to work up to about 40 grains with the round nose seated to the crimp cannelure, but less if the nose shape makes you seat it deeper for your rifle's throat? I recall Hatcher wrote of working with powder between the wars that he said was similar to modern IMR 4320. Figure to work up to about 41 grains of IMR 4320, if you decide to go to that? __________________ Gunsite Orange Hat Family Member CMP Certified GSM Master Instructor NRA Certified Rifle Instructor NRA Benefactor Member and Golden Eagle