Very Inaccurate Rifle

[Hsing-ee]

Took the old Crosman Model 70 to the range and tried a period Nikko Stirling 6x32 on it.

Off a bench, at ten yards it got 10 shots into a 4 x 5 inch 'group'. Verily, tis like a cylinder-bore 0.410 shotgun.

This is the worst accuracy of any air-rifle I have ever owned, on a par with the worst air-pistol I have ever owned.

The trigger is abomination, granted, but this is a fixed-barrel, recoilless CO2 bolt-gun with a rifled barrel. Whatever can be going wrong? I am going to try a different scope on it and see if that is the problem, but once that is eliminated, what can be going on? Do these things shave pellets?

I was expecting 1" groups at 10 yards, but this is ridiculous.

[Gareth W-B]

.
Use it as a fence post.

[tinbum]

I have just put a nice Leupold scope in sales, I'll bet that'd improve it!

[Phil G]

Took the old Crosman Model 70 to the range and tried a period Nikko Stirling 6x32 on it.

Off a bench, at ten yards it got 10 shots into a 4 x 5 inch 'group'. Verily, tis like a cylinder-bore 0.410 shotgun.

This is the worst accuracy of any air-rifle I have ever owned, on a par with the worst air-pistol I have ever owned.

The trigger is abomination, granted, but this is a fixed-barrel, recoilless CO2 bolt-gun with a rifled barrel. Whatever can be going wrong? I am going to try a different scope on it and see if that is the problem, but once that is eliminated, what can be going on? Do these things shave pellets?

I was expecting 1" groups at 10 yards, but this is ridiculous.

Has the barrel been shortened ? Is the muzzle crown good?

[Hsing-ee]

Its unmodified, the crown is recessed inside the plastic outer barrel. Will have a lookski...

[dayglowfroggy]

Period scope
Does it still work ?

[thor123]

wondering what is that pistol you were talking about?

[Hsing-ee]

wondering what is that pistol you were talking about?

Mondial Zip .177 pistol, Italian monkey-metal thing. Using hand-cast LEM Spitzer bullets it was incapable of hitting a 2 litre Cola bottle at 6 yards. With the usual 'Marksman' pellets it was a little better.

[MartynB]

If it has open sights, what's it like with those ?

[Hsing-ee]

Period scope
Does it still work ?

I'm going to swap it out for a modern one.

[TonyL]

I have no experience with this particular model, Al.

But, a couple of thoughts:-

Firstly, as mentioned, some often say that Crosman barrel crowning can be very variable.

Secondly, I'm wondering if the barrel is "fixed" at the breech end with the flimsy grub screw arrangement, as per the 766/2100 rifles and whether this has worked loose?

[eyebull]

Was going to mention crown also. Have you cleaned the bore? Someone may have been shooting silly plastic pellets through it, or there might be damage to the rifling.