.303 Brit sporter key holeing
Purchased a used .303 SMLE sporter. Has a loose bore and groove. What are my options on shooting this gun accurate. Factory (Wolf) ammo was going through the paper sideways at 100yd. Purchased some Cast bullets sized to .315. They too went through the paper sideways.
Giving thought to smokeless paper patching or experimenting with various sizes.
Don't want to overpressurize the rifle finding out the wrong load.
How do I determine the correct diameter to size to. I've pushed a soft lead slug through the bore but not sure how to measure the 5 groove rifling.
I've never done paper patching but would like to learn the process (without the excitement of overpressurization)
How much of what kind of powder and how to do the paper patch.
My bore is way out of spec, however...
I knew it was big. The bore diameter is about .308 or .310
The groove diameter is about .315
In a perfect world I would give this fine shooting rifle to my brother-in-law. My thought is to take it on as a project. See if I can get it to shoot using cast bullets and or paper patched cast bullets.
Having difficulty determining what diameter to size bullets to, then paper patch up to what size, Size again after paper patch, any lube on the paper at all, just wet and let dry then size?
I would think there is some secret formula that would allow the bullet to stabilize in flight rather than tumble randomly. I did have the muzzle recrowned to 11º so now I have $100 worth of gunsmithing into a $150 rifle that has a fair market value of about $80 as it is.