bolts the same for the gt and the mags should work as well. the whole point of the gt was to work in standard short action mags without the nose diving. honestly though the easy button would be just to replace with a 22 creed barrel, specifically if youre wanting to shoot the heavies. my 24 inch tube is 3480 with the 75 gr.Handholding isn’t an issue, but I wouldn’t want to have to modify the bolt, bottom metal, magazines, etc.