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Post by jeffgra on Jan 23, 2024 19:20:08 GMT -5
Has anybody tried to fire lap a scout? Would it be a mistake to load one, put some lapping compound in the choked area of the muzzle shoot then repeat until it opened up?
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Post by james72 on Jan 23, 2024 21:57:00 GMT -5
There are several members on here including myself that had CVA Scouts with choked barrels. It takes some elbow grease, but the method that I know for sure will work is hand lapping the choked area of the barrel. Below is a post I made last year after lapping my barrel...
I finished lapping my barrel this week, so I wanted to post an update. I hand lapped the barrel using 400 grit lapping compound and a tight fitting patch. I used a 45 caliber bronze brush wrapped with a 2-3/4" square cotton patch. First I lapped the tight end (last 6" of the barrel from the muzzle). Once this section matched the middle section of the barrel, I extended my stroke another 6". I stopped several times during the lapping process to clean, check bullet fit, and then lap again. It was a laborious process but worth it in the end. Your patch needs to be really tight. It should take some muscle to move it. As ballistic mentioned, when your barrel gets warm you will know you are making progress. How much metal did I remove? Only a guess, but maybe .0001 or .0002 from the lands. My bullet now sized at around .4505 loads with consistent pressure from muzzle to breech. How did it shoot? Better than before. My first trip to the range, I had several groups below 1" at 100 yards.
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Post by jims on Jan 24, 2024 21:32:33 GMT -5
I think sew has fire lapped some barrels but I do not think it was a scout although the process would be the same. I did it about 20 years ago with a Savage SML barrel but can't tell you the exact details although I bought a commercial soft lead kit etc. that I used. Do not recall the supplier. It helped in my barrel.
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Post by hillbill on Jan 25, 2024 10:49:01 GMT -5
A few years back I fire lapped a barrel, but this what I learned I ended up with a choked barrel, why? It only makes sense, the bullet Carry’s the compound down the bore on the bullet, as it goes it wears off thus wearing away metal as it goes, polishing as we know it. It wears less as it goes, therefore the choked barrel. Firelapping is meant for center fire barrels, not for what we do. A choked barrel in the CF world is not necessarily a bad thing, for us? It sucks
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Post by flattopusa on Jan 25, 2024 14:54:03 GMT -5
Like hillbill said fire lapping is ok for cartridge rifles but because fire lapping uniformly increases bore diameter its useless for our purposes...and I would not coat the last 6 inches of a bore with anything and attempt to shoot through it. I have hand lapped many bores and the correct way to do it in the case of a CVA SML is to first "slug" the muzzle end of the bore to get the "true" diameter of the bore at the muzzle (the choke), then "slug" the chamber end of the bore to get the bore nominal diameter. Once that is done and you know the measurements of your bore you can hand lap the choked end at the muzzle to achieve a uniform bore diameter. I use an adjustable lapping mandrel that I made years ago that allows for a lead lap to be poured to the exact diameter of the bore and then increase the O.D. of the lead lap to achieve the bore diameter needed. I slug that area of the bore to check my progress as I go and then blend the lapped area of the bore to the nominal diameter. It is a process, but it is precise and you stand no chance of over lapping the bore.
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Post by jeffgra on Jan 26, 2024 20:24:07 GMT -5
Thanks guys. I asked because all the choked scout threads had me wondering. It seemed like a good idea (short cut) not put the lapping compound on the bullet but on the bore in the choked area after loading.
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