Forums.NitroExpress.com

Thank you for your time and consideration hopefully 450 nitro express brass will be able to be trimmed to length and find some thick rim if needed to make it work I added pictures with measurements of my chamber cast it looks like I should be able to use standard 458 diameter bullets I will work slowly up after I get approval from my Gunsmith

Thank you again

James

quote]James, That is a very nice looking rifle. It looks like you have done a chamber cast to determine the possible caliber. Looking at COTW, there may be several different base cartridges that you can use to make your brass.

As usually, Mike hit the points that you should consider.

I usually do a chamber cast that includes the 1st : of the bore so I know what size bullet to use. As Mike said. you should slug the bore to determine twist rate. If the bore is uniform (you should be able to tell by the poressure it takes to push the slug thru), you can use the slug for bullet diameter.

For base brass, I first check head diameter, rim thickness, and case length because tose are most important to me. Of copurse, if necessary, base thickness can be cut down using a small lathe provided you don't thin the web and rim thickness can be thinned with a lathe or thickened by two methods.

Provided that the base, rim thickness, and length match, the case body can be sized down with various dies and then fireformed. Or at least, that is what I do.

Some of the black powder cases used fairly light (for caliber) bullets. The 450 BPE used a 270 gr bullet. The 10.75x65R Collath used a 250 gr bullet. However, twist rate should tell you what the builde intended to use, weight wise.

FYI: While not the same caliber, I have a Collath double rifle drilling in 10.75x65R x 10.75x65R x 32 ga. A chamber cast showed that the case was not the same as the commercial 10.75x65R so I used some other cases fireformed to 10 gr Bullseye. I only neck size with 44 mag dies.

Best success

Post Extras