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.