I'm new to centerfire rifles though I've shot rimfires all my life. I have a couple of related questions about measuring groups and the expected accuracy of a rifle...
I got a .30-30 Marlin 336 last year for deer hunting. Right now it has a cheap Simmons 3-9x40 (8-Point model) on some Weaver See-Thru Mounts. All the scope and mount purists are cringing right now, and I'm sure I'll get flames. But I like the setup, and I'm the one that has to shoot it.
I've only shot groups with the rifle at one range session, where I shot off of Protektor bags with plain-jane Remington Core-Lokt (150 gr). On the first group, I got three shots under an inch at 100 yards. I was quite happy with these results. This rifle was right out of the box with no work other than putting on the scope.
The pic here shows the 7th, 8th, and 9th cartridges I put through the rifle (took six shots to get sighted in to my satisfaction). Those are 1/2 inch grids, and in my understanding, you count the largest two-shot spread--center to center. (Or you can measure edge to edge and add the caliber of the bullet, right?) Here, the biggest spread between two shots was just under three-quarters of an inch. Am I measuring my groups correctly? I don't have calipers or anything fancy...just a normal old ruler calibrated to sixteenths of an inch.
After this group, I shot 3-shot groups of 2 inches, 1 1/2 inches, and 2 inches. I'm wondering if I should expect similar accuracy with good maintenance of the rifle. Or will its accuracy decline as the rifle gets older and gets more rounds through it?
[Edited by Guyon on 02-16-2001 at 04:12 PM]