I did my second home barrel instal recently. I used a PT&G saami 6.5 CM reamer. I had an old .260 barrel which had too tight a chamber to accept lapua .260 brass, so it was due for an update. Its a Broughton 5c, 8 twist, which had 1500 rounds through it, and one of the most accurate and forgiving barrels I've ever had. I also wanted to try out a new muzzle brake I got from Muzzle brakes and more. It's a .875" 3 port.
I started by installing the brake. It went well, and I found the bore of the brake to be extremely concentric with its threads and shoulder. Took less than .001" of boring to clean up all the baffle holes.
The chamber end didnt go quite so well. I was using a different carbide insert(seco instead of carmex), and for whatever reason it began to chatter a bit. I reached the target pitch diameter before I could get rid of it. Cutting the chamber with the new reamer went really well. Cut like butter. I made myself a new gauge for measuring headspace and barrel/receiver indexing. That was a big help. I didnt have that last time. I also used a reamer stop for depth of cut, which also helped a lot.
I'll post more pics and results below.
I started by installing the brake. It went well, and I found the bore of the brake to be extremely concentric with its threads and shoulder. Took less than .001" of boring to clean up all the baffle holes.
The chamber end didnt go quite so well. I was using a different carbide insert(seco instead of carmex), and for whatever reason it began to chatter a bit. I reached the target pitch diameter before I could get rid of it. Cutting the chamber with the new reamer went really well. Cut like butter. I made myself a new gauge for measuring headspace and barrel/receiver indexing. That was a big help. I didnt have that last time. I also used a reamer stop for depth of cut, which also helped a lot.
I'll post more pics and results below.
Attachments
Last edited:
